Personal care composition comprising beads

Abstract

Disclosed is a personal care composition comprising: (a) acrylic polymeric thickener; (b) glycinate surfactant; and (c) beads; wherein the weight ratio of the acrylic polymeric thickener to the beads is at least 10:1.

Description

[0001] P0001210 CPL

[0002] 1

[0003] PERSONAL CARE COMPOSITION

[0004] Field of the Invention

[0005] The present invention relates to a personal care composition. Particularly, the present invention 5 relates to a personal care composition comprising acrylic polymeric thickener, glycinate surfactant, and beads. It was surprisingly found that the beads were capable of being stably suspended and evenly dispersed in the composition when acrylic polymeric thickener was included in the composition at specific range of weight ratio of acrylic polymeric thickener to beads.

[0006] Background of the Invention

[0007] Traditional personal care compositions are provided in formulations such as skin cleanser, toner, lotion, cream, etc. To meet the emotional demand of consumers, there are increasing attempts to modify the traditional form of personal care compositions to give the user visual enjoying and esthetic perception.

[0008] 15

[0009] Among the attempts, beads in personal care composition may provide visual differentiation, new esthetic appea.l and also unique texture when applied to the skin of the consumers. However, visible beads may be difficult to stably suspend and disperse in the personal care compositions, particularly for those personal care compositions containing glycinate surfactant.

[0010] 20

[0011] Therefore, the present inventors have recognized a need to develop a personal care composition containing glycinate surfactant in which the beads may be stably suspended and dispersed. It was surprisingly found that only when acrylic polymeric thickener was incorporated into compositions containing glycinate surfactant at a specific weight ratio of acrylic polymeric 25 thickener to beads, were the beads capable of being stably suspended and evenly dispersed in the composition.

[0012] Summary of the Invention

[0013] In a first aspect, the present invention is directed to a personal care composition comprising: (a) 30 acrylic polymeric thickener; (b) glycinate surfactant; and (c) beads; wherein the weight ratio of the acrylic polymeric thickener to the beads is at least 10:1.

[0014] In a second aspect, the present invention is directed to a method of suspending a plurality of beads in a personal care composition comprising glycinate surfactant, the method comprising aP0001210 CPL

[0015] 2

[0016] step of incorporating acrylic polymeric thickener into the composition with a weight ratio of the acrylic polymeric thickener to the beads of at least 10: 1.

[0017] All other aspects of the present invention will more readily become apparent upon considering 5 the detailed description and examples which follow.

[0018] Detailed Description of the Invention

[0019] Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and / or use may optionally be understood as modified by the word “about”.

[0020] All amounts are by weight of the composition, unless otherwise specified.

[0021] It should be noted that in specifying any range of values, any particular upper value can be 15 associated with any particular lower value.

[0022] For the avoidance of doubt, the word “comprising” is intended to mean “including” but not necessarily “consisting of’ or “composed of’. In other words, the listed steps or options need not be exhaustive.

[0023] 20

[0024] The disclosure of the invention as found herein is to be considered to cover all embodiments as found in the claims as being multiply dependent upon each other irrespective of the fact that claims may be found without multiple dependency or redundancy.

[0025] 25 Where a feature is disclosed with respect to a particular aspect of the invention (for example a composition of the invention), such disclosure is also to be considered to apply to any other aspect of the invention (for example a method of the invention) mutatis mutandis.

[0026] Preferably the glycinate surfactant comprises alkyl glycinate, acyl glycinate (also known as alkyl 30 carboxy glycinate or alkanoyl glycinate), or a mixture thereof. More preferably, the glycinate surfactant comprises Cs-24 alkyl glycinate, Cs-24 acyl glycinate, or a mixture thereof. Even more preferably, the glycinate surfactant comprises C12-20 alkyl glycinate, C12-20 acyl glycinate, or a mixture thereof. Preferably, the glycinate surfactant is anionic.P0001210 CPL

[0027] 3

[0028] Preferably, the glycinate surfactant is acyl glycinate, more preferably Cs-24 acyl glycinate, even more preferably is C12-20 acyl glycinate, and still even more preferably is cocoyl glycinate, and most preferably is sodium cocoyl glycinate.

[0029] 5 The glycinates are generally used in the form of their salts. Preferably, the glycinate is in the form of alkali metal salt, and / or ammonium salt. More preferably, the glycinate is in the form of potassium, sodium salt and / or trialkanolammonium salt.

[0030] Typically, the glycinate surfactant is present in amount of 0.001 to 18% by weight of the composition. Preferably, the glycinate surfactant is present in amount of 0.1 to 12%, more preferably 0.5 to 10%, even more preferably 2 to 7% by weight of the composition.

[0031] Preferably the composition comprises acrylic polymeric thickener. The acrylic polymeric thickeners as used herein means polymeric thickener comprising, as polymerized monomer, 15 acrylic acid, substituted acrylic acid, ester and / or salt thereof. Preferably, the acrylic polymeric thickener comprises, as polymerized monomer, acrylic acid, methacrylic acid, esters or salts of acrylic acid, esters or salts of methacrylic acid, acrylonitrile, acrylamide, cyanoacrylates, and / or combination thereof. More preferably, the acrylic polymeric thickener comprises polyacrylates, polyacrylamides, polymethacrylate, acrylate copolymer, hydrophobically modified acrylate 20 copolymer, methacrylate copolymer, acrylamide copolymer, acryloyldimethyltaurate copolymer, or a mixture thereof. The hydrophbically modified acrylate copolymer is preferably acrylates / C IQ- 30 alkyl acrylate crosspolymer. Even more preferably, the acrylic polymeric thickener comprises polyacrylate, polyacrylamide, acryloyldimethyltaurate copolymer, acrylate copolymer, acrylates / C 10-30 alkyl acrylate crosspolymer, or a mixture thereof. Still even more preferably, 25 the acrylic polymeric thickener comprises polyacrylate, acrylate copolymer, acrylates / C 10-30 alkyl acrylate crosspolymer, or mixture thereof. Still even more preferably, the acrylic polymeric thickener comprises acrylate copolymer, acrylates / C 10-30 alkyl acrylate crosspolymer, or mixture thereof. Still even more preferably, the acrylic polymeric thickener is acrylate copolymer, acrylates / C 10-30 alkyl acrylate crosspolymer, or mixture thereof. Still even more preferably, the 30 acrylic polymeric thickener comprises acrylate copolymer. Still even more preferably, the acrylic polymeric thickener is acrylates copolymer. Example of a suitable acrylates copolymer is commercially available from Guangzhou Tinci Materials Technology Co., Ltd under the trade name EMUL 34C.P0001210 CPL

[0032] 4

[0033] Preferably, the amount of the acrylic polymeric thickener is in the range of 0.01 to 15%, more preferably 0.1 to 10%, even more preferably 0.5 to 8%, and still even more preferably 1 to 6% by weight of the composition.

[0034] 5 Beads as used herein refers to solid or semisolid particles having average diameter of 100 to 6000 microns. Average diameter as used herein means the apparent volume median diameter (D50, also known as x50 or sometimes d(0.5)) of the beads. The diameter may be measurable for example, by laser diffraction using a system (such as a Mastersizer™ 2000 available from Malvern Instruments Ltd) meeting the requirements set out in ISO 13320 unless otherwise stated.

[0035] Preferably, the beads are formed of a matrix which may either constitute a natural polymer, a synthetic polymer or combinations thereof. Typical natural polymers are carboxymethyl cellulose, cellulose acetate phthalate, ethyl cellulose, propyl hydroxycellulose, gelatin, gum arabic, starch, methyl cellulose, waxes, alginates, and combinations thereof. Among the synthetic polymers are 15 included polyvinyl alcohol, polyethylene, polypropylene, polyether, ethylene vinyl acetate copolymer, polyvinylidene chloride, polyhydroxyethyl methacrylate, polyacrylate, polymethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, and combinations thereof.

[0036] 20 Preferably the beads of this invention have matrices based on the natural polymers of cellulose and / or modified cellulose. Modified cellulose may be selected from hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose or combinations thereof. The matrices may comprise sugars. Sugars may be selected from mannitol, sorbitol, xylitol, lactose, and mixtures thereof. More preferred the beads have a matrix 25 of mannitol, microcrystalline cellulose and hydroxypropyl methyl cellulose.

[0037] Preferably, the beads comprise cellulose, modified cellulose, or a mixture thereof. More preferably, the beads comprise cellulose, microcrystalline cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and combinations thereof. Preferably, the bead comprises sugars. More preferably the bead comprises mannitol, sorbitol, xylitol, sucrose, lactose, or mixtures thereof. Even more preferably, the bead comprises mannitol.

[0038] The bead may further comprise a coloring agent. The coloring agent may be embedded within 35 the matrix of the beads.P0001210 CPL

[0039] 5

[0040] Preferably, the average diameter of beads may range from 200 to 3000 micron, more preferably from 400 to 2000 micron, even more preferably 500 to 1500 micron, optimally from 700 to 1100 micron.

[0041] 5

[0042] Preferably, the beads are substantially spherical in shape. Preferably, the beads are visible. Visible as used herein refers that the beads can be separately seen by naked human eye as distinctly separate regions from the other regions they contact.

[0043] 10 Typically, the composition comprises 5 to 5000 beads in one milliliter (1 ml) of personal care composition. The composition comprises preferably 10 to 1000, more preferably 20 to 500 beads in one milliliter (1 ml) of the composition.

[0044] Preferably the bulk density of the beads is 200 to 1800 kg / m3, more preferably 500 to 1200 kg / m3, 15 even more preferably 700 to 900 kg / m3.

[0045] Preferably, the beads may be present in amount of 0.001 to 10%, more preferably 0.01 to 5%, even more preferably 0.05 to 2%, still even more preferably 0.1 to 0.5% by weight of the composition.

[0046] 20

[0047] Preferably, the weight ratio of the acrylic polymeric thickener to the glycinate surfactant is in the range of 1:20 to 20:1, more preferably 1:10 to 10:1, even more preferably 1:3 to 3:1.

[0048] The weight ratio of the acrylic polymeric thickener to the beads is at least 10:1. It is preferred that 25 the weight ratio of the acrylic polymeric thickener to the beads is at least 15:1. Preferably, the weight ratio of the acrylic polymeric thickener to the beads is at 10:1 to 500:1, more preferably 10:1 to 150:1, more preferably 10:1 to 100:1, more preferably 10:1 to 60:1, more preferably 10:1 to 50:1, more preferably 10:1 to 30:1, more preferably 10:1 to 26:1, more preferably 15:1 to 25:1.

[0049] 30 The composition may or may not comprise fatty ester of polyoxyethylene glycol ether. The amount of fatty ester of polyoxyethylene glycol ether may range 0 to 5%, more preferably 0 to 2% by weight of the composition. Preferably, the amount of the acrylic polymeric thickener accounts for at least 30%, more preferably at least 50%, even more preferably 60 to 100% by weight of the total acrylic polymeric thickener and polyoxyethylene glycol ether.P0001210 CPL

[0050] 6

[0051] Preferably, the compositions have a transmittance of light of at least 50%, more preferably at least 65%, even more preferably at least 78%, and still even more preferably at least 86%. Values of transmittance quoted herein are determined at a wavelength of 550 nm at 25°C using a 1 centimeter (1 cm) cuvette. Transmittance is used herein as a measure of transparency and so 5 should be determined in the absence of any chromophores with appreciable absorbance at 550 nm. Transmittance may be measured with a LI -vis spectrometer (e.g. Perkin-Elmer Lambda 6508).

[0052] The composition preferably further comprises a cleansing surfactant. More than one cleansing surfactant may be included in the composition. The cleaning surfactant may be chosen from soap, non-soap anionic, cationic, non-ionic, amphoteric surfactant, and mixtures thereof. The preferred surface-active compounds that can be used are soaps, non-soap anionic, non-ionic surfactant, amphoteric surfactant, or a mixture thereof.

[0053] 15 Suitable non-soap anionic surfactants include linear alkylbenzene sulphonate, primary and secondary alkyl sulphates, particularly Cs to C15 primary alkyl sulphates; alkyl ether sulphates; olefin sulphonates; alkyl xylene sulphonates; dialkyl sulphosuccinates; fatty acid ester sulphonates; or a mixture thereof. Sodium salts are generally preferred.

[0054] 20 Most preferred non-soap anionic surfactant are linear alkylbenzene sulphonate, particularly linear alkylbenzene sulphonates having an alkyl chain length of from Cs to C15. It is preferred if the level of linear alkylbenzene sulphonate is from 0 wt% to 30 wt%, more preferably from 1 wt% to 25 wt%, most preferably from 2 wt% to 15 wt%, by weight of the total composition.

[0055] 25 Nonionic surfactants that may be used include primary and secondary alcohol ethoxylates, especially the Cs to C20 aliphatic alcohols ethoxylated with an average of from 1 to 20 moles of ethylene oxide per mole of alcohol, and more especially the C10 to C15 primary and secondary aliphatic alcohols ethoxylated with an average of from 1 to 10 moles of ethylene oxide per mole of alcohol. Non ethoxylated nonionic surfactants include alkylpolyglycosides, glycerol monoethers, and polyhydroxyamides (glucamide). It is preferred if the level of non-ionic surfactant is from 0 wt% to 30 wt%, preferably from 1 wt% to 25 wt%, most preferably from 2 wt% to 15 wt%, by weight of the composition .

[0056] It is also possible to include certain mono-alkyl cationic surfactants. Cationic surfactants that may 35 be used include quaternary ammonium salts of the general formula R1R2R3R4N+X' wherein theP0001210 CPL

[0057] 7

[0058] R groups are long or short hydrocarbon chains, typically alkyl, hydroxyalkyl or ethoxylated alkyl groups, and X is a counter-ion (for example, compounds in which R1is a C8-C22 alkyl group, preferably a Cs-C or C12-C14 alkyl group, R2is a methyl group, and R3and R4, which may be the same or different, are methyl or hydroxyethyl groups); and cationic esters (for example, choline 5 esters).

[0059] Water-soluble skin benefit agents may optionally be formulated into the compositions of the invention. A variety of water-soluble skin benefit agents can be used, and the level can be from 0.1 to 50% but preferably from 1 to 30% by weight of the composition. These materials include, but are not limited to, polyhydroxy alcohols. Preferred water-soluble skin benefit agents are glycerin, sorbitol and polyethylene glycol.

[0060] Water-insoluble skin benefit agents may also be formulated into the compositions as conditioners and moisturizers. Examples include silicone oils; hydrocarbons such as liquid paraffins, 15 petrolatum, microcrystalline wax, and mineral oil; and vegetable triglycerides such as sunflower seed and cottonseed oils.

[0061] Preservatives can desirably be incorporated into the compositions of this invention to protect against the growth of potentially harmful microorganisms. Particularly preferred preservatives 20 may be selected from phenoxyethanol, imidazolidinyl urea, sodium dehydroacetate and benzyl alcohol. The preservatives should be selected having regard for the use of the composition and possible incompatabilities between the preservatives and other ingredients. Preservatives are preferably employed in amounts ranging from 0.01% to 2% by weight of the composition.

[0062] 25 A variety of other optional materials may be formulated into the compositions. These may include:

[0063] antimicrobials such as 2-hydroxy-4,2’,4’-trichlorodiphenylether (triclosan), 2,6-dimethyl-4- hydroxychlorobenzene, and 3,4,4’-trichlorocarbanilide; scrub and exfoliating particles such as polyethylene and silica or alumina; cooling agents such as menthol; skin calming agents such as aloe vera; and colorants.

[0064] In addition, the compositions of the invention may further include 0.5 to 10% by weight of sequestering agents, such as tetra sodium ethylenediaminetetraacetate (EDTA), EHDP or mixtures; opacifiers and pearlizers such as ethylene glycol distearate, titanium dioxide or Lytron 621 (Styrene / Acrylate copolymer); all of which are useful in enhancing the appearance or 35 properties of the product.P0001210 CPL

[0065] 8

[0066] Preferably the composition comprises water in an amount of at least 5% by weight of the composition, more preferably at least 25%, even more preferably 40 to 90% and still even more preferably at least 60 to 85% by weight of the composition.

[0067] 5

[0068] Preferably, the composition has a viscosity of at least 50 mPa s, more preferably in the range 100 to 100000 mPa s, even more preferably 600 to 15000 mPa s, and most preferably 2000 to 5000 mPa s, when measured at 25°C) at a relatively high shear rate of about 20 s-1(e.g. with a Brookfield spindle 5 at 20 rpm by Brookfield RVDV2 Viscometer). Preferably, the composition is in the form of fluid.

[0069] The personal care composition refers to a composition suitable for topical application to humans, including leave-on and wash-off products but preferably leave-on compositions. The term “leave- on” as used with reference to compositions herein means a composition that is applied to or 15 rubbed on the skin and left thereon. The term “wash-off” as used with reference to compositions herein means a skin cleanser that is applied to or rubbed on the skin and rinsed off substantially immediately subsequent to application. Preferably the personal care composition means a fluid liquid, and particularly a skin cleanser rather than a make-up product.

[0070] 20 Preferably, the personal care composition is a skin cleansing composition. The term "skin" as used herein includes the skin on the face, neck, chest, abdomen, back, arms, underarms, hands, and legs.

[0071] The following examples are provided to facilitate an understanding of the invention. The examples 25 are not intended to limit the scope of the claims.

[0072] Examples

[0073] Example 1

[0074] This example demonstrates the improved suspension of beads in composition containing 30 glycinate surfactant by including acrylic polymeric thickener into the composition at a specific weight ratio of acrylic polymeric thickener to beads.P0001210 CPL

[0075] Table 1

[0076]

[0077] *The level of the ingredients refers the level of active.

[0078] a: EMLIL 34C, procured from Guangzhou Tinci Materials Technology Co., Ltd.

[0079] 5 b: Colorlets White, Procured from Chongqing Pellets Biotech Co., Ltd.

[0080] A number of skin cleansing formulations were prepared according to Table 1 using a standard procedure.

[0081] 10 The performances of suspension and dispersion of beads in all samples were evaluated by the procedure as follows: identical amounts of each sample were put into transparent bottles. The transparent bottles with samples inside were placed into oven at 5°C, ambient temperature, and 50°C, respectively for 24 hours. Then, the transparent bottle with samples inside were taken out, observed, and recorded in Table 2.

[0082] The performances of all samples were recorded in Table 2.

[0083] Table 2

[0084]

[0085] x: most beads on the bottom; - : acceptable;

[0086]

[0087] good

[0088] 20

[0089] It was surprisingly found that only when acrylic polymeric thickener was incorporated into the composition at a weight ratio of acrylic polymeric thickener to beads within the range of present invention, were the beads capable of being suspended and distributed evenly in the composition.P0001210 CPL

[0090] In contrast, when the composition did not contain acrylic polymeric thickener or when the weight ratio of acrylic polymeric thickener to beads was outside the range of present invention, the beads were not capable of being suspended in the composition.

[0091] 5 Example 2

[0092] This example demonstrates the impact of weight ratio of the acrylic polymeric thickener to the beads in the composition.

[0093] Table 3

[0094]

[0095] *The level of the ingredients refers the level of active.

[0096] a: EMLIL 34C, procured from Guangzhou Tinci Materials Technology Co., Ltd.

[0097] b: Colorlets White, Procured from Chongqing Pellets Biotech Co., Ltd.

[0098] 15 A number of skin cleansing formulations were prepared according to Table 3 using a standard procedure.

[0099] The performances of suspension and dispersion of beads in all samples were evaluated by the same procedure as described in Example 1.

[0100] 20

[0101] The performances of all samples were recorded in Table 4.

[0102] Table 4

[0103]

[0104] x: most beads on the bottom; - : acceptable

[0105] 25P0001210 CPL

[0106] 11

[0107] It was surprisingly found that only when acrylic polymeric thickener was incorporated into the composition at a weight ratio of acrylic polymeric thickener to beads within the range of present invention, were the beads capable of being suspended and distributed evenly in the composition at different temperatures. In contrast, when the composition did not contain acrylic polymeric 5 thickener or the weight ratio of acrylic polymeric thickener to beads was outside the range of present invention, the beads were not capable of being suspended in the composition, especially at high temperatures (50°C). The composition of the present invention showed improved stability, compared to the composition outside the scope of the invention.

Claims

P0001210 CPL12Claims1. A personal care composition comprising:(a) acrylic polymeric thickener;(b) glycinate surfactant; and(c) beads;wherein the weight ratio of the acrylic polymeric thickener to the beads is at least 10: 1.

2. The composition according to claim 1 wherein the glycinate surfactant comprises alkyl glycinate, acyl glycinate or a mixture thereof, preferably the glycinate surfactant comprises C12-20 alkyl glycinate, C12-20 acyl glycinate, or a mixture thereof.

3. The composition according to claim 2 wherein the glycinate surfactant comprises C12-20 acyl glycinate, preferably the glycinate surfactant is cocoyl glycinate.

4. The composition according to any one of the preceding claims wherein the glycinate surfactant is present in amount of 0.001 to 18% by weight of the composition, more preferably 0.5 to 10% by weight of the composition.

5. The composition according to any one of the preceding claims wherein the acrylic polymeric thickener comprises polyacrylates, polyacrylamides, polymethacrylate, acrylate copolymer, hydrophobically modified acrylate copolymer, methacrylate copolymer, acrylamide copolymer, acryloyldimethyltaurate copolymer, or a mixture thereof preferably, the acrylic polymeric thickener is acrylates copolymer.

6. The composition according to any one of the preceding claims wherein the amount of the acrylic polymeric thickener is in the range of 0.01 to 15%, preferably 0.5 to 8% by weight of the composition.

7. The composition according to any one of the preceding claims wherein the beads comprise cellulose, modified cellulose or a mixture thereof, preferably, the beads comprise cellulose, microcrystalline cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and combinations thereof.P0001210 CPL138. The composition according to any one of the preceding claims wherein the bead comprises sugars, preferably the bead comprises mannitol, sorbitol, xylitol, sucrose, lactose, or mixtures thereof, more preferably the bead comprises mannitol.

9. The composition according to any one of the preceding claims wherein the average diameter of beads ranges from 200 to 3000 micron, preferably 500 to 1500 micron.

10. The composition according to any one of the preceding claims wherein the composition comprises 5 to 5000 beads, preferably 20 to 500 beads in one milliliter of personal care composition.

11. The composition according to any one of the preceding claims wherein the beads is present in amount of 0.001 to 10%, preferably 0.05 to 2% by weight of the composition.

12. The composition according to any one of the preceding claims wherein the weight ratio of the acrylic polymeric thickener to the glycinate surfactant is in the range of 1 :20 to 20: 1 , preferably 1:10 to 10:1.

13. The composition according to any one of the preceding claims wherein the weight ratio of the acrylic polymeric thickener to the beads is at 10: 1 to 500: 1 , preferably 10:1 to 60: 1.

14. The composition according to any one of the preceding claims wherein the compositions have a transmittance of light of at least 50%.

15. A method of suspending a plurality of beads in a personal care composition comprising glycinate surfactant, comprising a step of incorporating acrylic polymeric thickener into the composition with a weight ratio of the acrylic polymeric thickener to the beads of at least 10: 1.

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